Christian Muller, Chalmers Univ of Technology
Mariano Campoy-Quiles, Institute of Materials Science of Barcelona, ICMAB-CSIC
Christine Luscombe, University of Washington
Alberto Salleo, Stanford Univ
EM4.1: Organic Photovoltaics I
Monday AM, November 28, 2016
Hynes, Level 3, Ballroom B
8:30 AM - *EM4.1.01
Revolutionizing Roll-to-Roll Manufacturing of Organic Photovoltaics by Robust In-Line Optical Metrology
Argiris Laskarakis 1 , Alexandros Zachariadis 1 , Christos Kapnopoulos 1 , Dimitris Papas 1 , Evaggelos Mekeridis 2 , Vasilios Matskos 2 , Stergios Logothetidis 1
1 Department of Physics, Aristotle University of Thessaloniki Nanotechnology Lab LTFN Thessaloniki Greece, 2 Organic Electronic Technologies P.C. (OET) Thessaloniki GreeceShow Abstract
One of the most promising technologies to address the energy generation from renewable sources is the organic and printed photovoltaics (OPVs). OPVs have the potential to provide energy harvesting capabilities to numerous consumer products, such as automotive and transport, buildings, wearables, portable devices, and consumer applications. Their outstanding advantages include lightweight, thin film form factor, conformability to complex surfaces in combination to high aesthetics and tunable optical performance. Furthermore, they can be combined to numerous other electronic devices, such as sensors, to provide energy efficiency and independence to the electric grid.
This potential of OPVs will be unleashed only after their large-area fabrication by cost-effective Roll-to-Roll (R2R) manufacturing processes, that will enable their commercialization and market implementation. Nevertheless, one of the major challenges that need to be overcome, is the capability to manufacture high quality OPV nanolayers and devices with reproducible and tailored properties (optical, electrical, structural), homogeneity in thickness and structure, as well as high performance over large areas, by R2R production processes.
Robust optical metrology techniques have an enormous potential to be used as quality control tools for R2R manufacturing processes. This is attributed to their flexibility for adaptation to pilot and production equipment, to their high speed (capability to measure optical spectra in ms) and to the capability to use sophisticated modelling approaches to determine the optical properties, composition and thickness of the material under study.
In this work, we describe the novel methodology for the in-line optical metrology of R2R printed nanomaterials (e.g. transparent electrodes, polymer-based organic semiconductors, barrier nanolayers) onto flexible substrates for manufacturing of OPVs. Sophisticated modelling procedures and methodologies has been developed to investigate the optical properties, homogeneity, thickness, quality and surface-property relationships of bulk-heterojunction photoactive layers for printed OPVs that consist of electron donors (e.g. polythiophene and carbazole based polymers) and acceptors (e.g. fullerene derivatives, indene C60 and C70 bis adduct, etc.).
Finally, the in-line optical metrology has been implemented for the optimization of the flexible OPV manufacturing and the achievement of high efficiency printed OPV devices. This innovative methodology establishes the importance and applicability of optical monitoring tools to be used as necessery components for R2R pilot lines for the cost-effective manufacturing of novel organic and inorganic nanolayers for several Organic and Printed Electronics applications.
8:45 AM - EM4.1.02
“All-Polymer” BHJ Solar Cells with Perylenediimide/Naphthalenediimide-Free Polymer Acceptors
Zhipeng Kan 1
1 KAUST Solar Center King Abdullah University of Science and Technology Thuwal Saudi ArabiaShow Abstract
Polymer acceptors are promising fullerene alternatives because their spectral absorption can extend into the visible and near-infrared regions of the solar spectrum. Their synthetic modularity provides leverage for tunable molecular frontier orbitals (HOMO and LUMO) and optical bandgaps that can be complementary to those of their polymer donor counterpart in bulk heterojunction (BHJ) solar cells. Spectral complementarity helps achieve higher device photocurrents and, in turn, high BHJ solar cell efficiencies. Because polymers show better morphological and mechanical resilience under stress compared with molecular donors and acceptors, “all-polymer” BHJ solar cells benefit from longer-term stabilities compared with that of fullerene-based BHJ devices (e.g. PC61BM, or its C71 analogue). At this time, most efficient polymer acceptors are based on perylenediimide (PDI) or naphthalenediimide (NDI) motifs, and a few recent reports have shown that PDI/NDI-based polymers blended with selected polymer donors can achieve power conversion efficiencies (PCE) >6%. Several other acceptor motifs are currently being studied across the community, such as diketopyrrolopyrrole, benzothiadiazole, isoindigo, B←N bridged bipyridyl, and various nitrile (-CN) derivatizations; however, only a few polymer systems can achieve PCEs comparable to those of PDI/NDI-based polymer acceptors and identifying material systems that can gradually improve device performance beyond currently reported PCEs remains a critically important direction. Our recent studies geared to the design, examinations, and synthetic derivatizations of PDI/NDI-free polymer acceptors for all-polymer BHJ solar cells